6. REVENUE RECOGNITION (Tables)

6 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenues

Revenues are comprised of the following for the three and six months ended December 31, 2020 and 2019:

	Three Months Ended December 31,				Six Months Ended December 31,
	2020		2019		2020		2019
Engineering Design Services	$	847,988	$	478,441	$	1,437,220	$	888,169
Optical Components		1,398,213		1,532,843		2,874,298		2,949,087
Medical Device Products and Assemblies		539,249		785,478		1,231,833		1,474,490
Total Revenues	$	2,785,450	$	2,796,762	$	5,543,351	$	5,311,746

Contract Liabilities

Contract liabilities, which were recorded as customer advances in the Company’s Consolidated Balance Sheets, and unearned revenue are comprised of the following:

	Three Months Ended December 31,						Six Months Ended December 31,
	2020			2019			2020			2019
Contract liabilities, beginning of period	$	206,665		$	513,623		$	417,059		$	450,192
Unearned revenue received from customers		127,571			97,143			171,703			293,019
Revenue recognized		(182,359	)		(222,260	)		(436,885	)		(354,705	)
Contract liabilities, end of period	$	151,877		$	388,506		$	151,877		$	388,506